Mon·Mar 20, 2017Monday·March 20, 2017

1. 01*

   A COHERENT Search Strategy for Beyond Standard Model Neutrino Interactions

   Ian M. Shoemaker🇺🇸

   We study the sensitivity of the stopped pion source of neutrinos at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory to neutrino non-standard interactions (NSI). In particular, we find that simple event counting above threshold can improve constraints on NSI for electron- and muon- flavored NSI, with the strongest constraints arising for flavor-diagonal NSI coupling to $\mu$ neutrinos. However, if the detector resolution is sufficient to all for even a coarse spectral study of events, COHERENT will also be sensitive to the mass scale of NSI. We demonstrate that this can yield new limits on $Z^{\prime }$ completions of NSI if the gauge boson mass is $\lesssim 1$ GeV.

   hep-phhep-exPRD(2017)·47 citations
2. 02*

   $K\to \pi \nu \overline{\nu }$ in the MSSM in Light of the ${ϵ}_K^{\prime }/{ϵ}_K$ Anomaly

   Andreas Crivellin🇨🇭 · Giancarlo D'Ambrosio🇮🇹 · Teppei Kitahara🇩🇪 · Ulrich Nierste🇩🇪

   The Standard-Model (SM) prediction for the CP-violating quantity ${ϵ}_K^{\prime }/{ϵ}_K$ deviates from its measured value by 2.8 $\sigma$. It has been shown that this tension can be resolved within the Minimal Supersymmetric Standard Model (MSSM) through gluino-squark box diagrams, even if squarks and gluinos are much heavier than 1 TeV. The rare decays $K_L\to {\pi }^0\nu \bar{\nu }$ and $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ are similarly sensitive to very high mass scales and the first one also measures CP violation. In this article, we analyze the correlations between ${ϵ}_K^{\prime }/{ϵ}_K$ and $B(K_L\to {\pi }^0\nu \bar{\nu })$ and $B(K^{+}\to {\pi }^{+}\nu \bar{\nu })$ within the MSSM aiming at an explanation of ${ϵ}_K^{\prime }/{ϵ}_K$ via gluino-squark box diagrams. The dominant MSSM contribution to the $K\to \pi \nu \bar{\nu }$ branching fractions stems from box diagrams with squarks, sleptons, charginos, and neutralinos, and the pattern of the correlations is different from the widely studied $Z$-penguin scenarios. This is interesting in light of future precision measurements by KOTO and NA62 at J-PARC and CERN, respectively. We find $B(K_L\to {\pi }^0\nu \bar{\nu })/B^{SM}(K_L\to {\pi }^0\nu \bar{\nu })\lesssim 2(1.2)$ and $B(K^{+}\to {\pi }^{+}\nu \bar{\nu })/B^{SM}(K^{+}\to {\pi }^{+}\nu \bar{\nu })\lesssim 1.4(1.1)$, if all squark masses are above 1.5 TeV, gaugino masses obey GUT relations, and if one allows for a fine-tuning at the $1\%(10\%)$ level for the gluino mass. Larger values are possible for a tuned CP violating phase. Furthermore, the sign of the MSSM contribution to ${ϵ}_K^{\prime }$ imposes a strict correlation between $B(K_L\to {\pi }^0\nu \bar{\nu })$ and the hierarchy between the masses $m_{\bar{U}}$, $m_{\bar{D}}$ of the right-handed up-squark and down-squark: sgn$[B(K_L\to {\pi }^0\nu \bar{\nu })-B^{SM}(K_L\to {\pi }^0\nu \bar{\nu })]=$sgn$(m_{\bar{U}}-m_{\bar{D}})$.

   hep-phhep-exPRD(2017)·54 citations
3. 03*

   NLO QCD Corrections to Off-shell $t\bar{t}$ and $t\bar{t}H$ at the ILC

   Jürgen Reuter🇩🇪 · Bijan Chokoufe Nejad🇩🇪 · Christian Weiss🇩🇪

   We discuss top-quark physics at the ILC with a focus on the full off-shell processes for $t\bar{t}$ and $t\bar{t}H$ production, including top-quark decays and also leptonic $W$ decays. A special focus is on the matching of the resummed vNRQCD threshold calculation and the fixed-order NLO QCD continuum calculation, where we present an update on the validation of the matching. All of the calculations have been performed in the \wz event generator framework.

   hep-phhep-ex4 citations
4. 04*

   Small-$x$ Asymptotics of the Quark Helicity Distribution: Analytic Results

   Yuri V. Kovchegov🇺🇸 · Daniel Pitonyak🇺🇸 · Matthew D. Sievert🇺🇸

   In this Letter, we analytically solve the evolution equations for the small-$x$ asymptotic behavior of the (flavor singlet) quark helicity distribution in the large-$N_c$ limit. These evolution equations form a set of coupled integro-differential equations, which previously could only be solved numerically. This approximate numerical solution, however, revealed simplifying properties of the small-$x$ asymptotics, which we exploit here to obtain an analytic solution. We find that the small-$x$ power-law tail of the quark helicity distribution scales as $\Delta q^S(x,Q^2)\sim {\left(\frac{1}{x}\right)}^{{\alpha }_h}$ with ${\alpha }_h=\frac{4}{\sqrt{3}}\sqrt{\frac{{\alpha }_s{N}_c}{2\pi }}$, in excellent agreement with the numerical estimate ${\alpha }_h\approx 2.31\sqrt{\frac{{\alpha }_s{N}_c}{2\pi }}$ obtained previously. We then verify this solution by cross-checking the predicted scaling behavior of the auxiliary "neighbor dipole amplitude" against the numerics, again finding excellent agreement.

   hep-phnucl-thPLB(2017)·79 citations
5. 05*

   AdS/CFT predictions for azimuthal and momentum correlations of $b\bar{b}$ pairs in heavy ion collisions

   R. Hambrock🇿🇦 · W. A. Horowitz🇿🇦

   We use an energy loss model sensitive to thermal fluctuations to compute the azimuthal and momentum correlations of $b\bar{b}$ pairs traversing a strongly coupled plasma from Pb+Pb collisions at LHC ($\sqrt{s}=2.76\text{TeV}$). The azimuthal correlations are compared with those from perturbative QCD based simulations. When restricted to leading order production processes, we find that the strongly coupled correlations of high transverse momentum pairs ($>4\text{GeV}$) are broadened less efficiently than the corresponding weak coupling based correlations, while low transverse momentum pairs (1-4GeV) are broadened with similar efficiency, but with an order of magnitude more particles ending up in this momentum class. The strong coupling momentum correlations we compute account for initial correlations and reveal that the particle pairs suppressed from initially high momenta to the low momentum domain do not suffice to explain the stark difference to the weak coupling results in momentum correlations for 1-4GeV. From this, we conclude that $b\bar{b}$ pairs are more likely to stay correlated in momentum when propagating through a strongly coupled plasma than a weakly coupled one.

   hep-phNucl.Part.Phys.Proc.(2017)·23 citations
6. 06*

   Yield ratios of identified hadrons in p+p, p+Pb, Pb+Pb collisions at the Large Hadron Collider

   Feng-lan Shao🇨🇳 · Guo-jing Wang🇨🇳 · Rui-qin Wang🇨🇳 · Hai-hong Li🇨🇳 · Jun Song🇨🇳

   Yield ratios of identified hadrons observed in high multiplicity p+p and p+Pb collisions at LHC show remarkable similarity with those in Pb+Pb collisions, indicating some important and universal underlying dynamics in hadron production for different quark gluon final states. We use the quark combination model to explain the data of yield ratios in these three collision systems. The observed $p/\pi$ and $\Lambda /K_s^0$ can be reproduced simultaneously by quark combination, and these two ratios reflect the rate of baryon production at hadronization which is the same in light sector and strange sector and is roughly constant in p+p, p+Pb and Pb+Pb collision systems over three orders of magnitude in charged particle multiplicity.The data of $K_s^0/\pi$, $\Lambda /\pi$, $\Xi /\pi$ and $\Omega /\pi$ show a hierarchy behavior relating to the strangeness content, and are naturally explained by quark combination both in the saturate stage at high multiplicity and in the increase stage at moderate multiplicity. Our results suggest that the dynamical characteristic of quark combination is necessary in describing the production of hadrons in small systems created in p+p and p+Pb collisions.

   hep-phnucl-thPRC(2017)·18 citations
7. 07*

   High scale flavor alignment in two-Higgs doublet models and its phenomenology

   Stefania Gori🇺🇸 · Howard E. Haber🇺🇸 · Edward Santos🇺🇸

   The most general two-Higgs doublet model (2HDM) includes potentially large sources of flavor changing neutral currents (FCNCs) that must be suppressed in order to achieve a phenomenologically viable model. The flavor alignment ansatz postulates that all Yukawa coupling matrices are diagonal when expressed in the basis of mass-eigenstate fermion fields, in which case tree-level Higgs mediated FCNCs are eliminated. In this work, we explore models with the flavor alignment condition imposed at a very high energy scale, which results in the generation of Higgs-mediated FCNCs via renormalization group running from the high energy scale to the electroweak scale. Using the current experimental bounds on flavor changing observables, constraints are derived on the aligned 2HDM parameter space. In the favored parameter region, we analyze the implications for Higgs boson phenomenology.

   hep-phJHEP(2017)·70 citations
8. 08*

   Prospects for 2HDM charged Higgs searches

   M Krawczyk🇵🇱 · S Moretti🇬🇧 · P Osland🇳🇴 · GM Pruna🇨🇭 · R Santos🇵🇹

   We discuss the prospects for charged Higgs boson searches at the LHC, within the two-Higgs-doublet models (2HDM). The 2HDM is generally less constrained than the corresponding sector of the MSSM, but there are still severe theoretical and experimental constraints that already exclude significant regions of the naive parameter space. Explicit searches in the $H^{+}\to {\tau }^{+}\nu$ and $H^{+}\to t\bar{b}$ channels are further restricting parts of the 2HDM parameter space.

   hep-phJ.Phys.Conf.Ser.(2017)·5 citations
9. 09*

   Baryon number fluctuations in chiral effective models and their phenomenological implications

   Gabor Almasi🇩🇪 · Bengt Friman🇩🇪 · Krzysztof Redlich🇵🇱

   We study the critical properties of net-baryon-number fluctuations at the chiral restoration transition in a medium at finite temperature and net baryon density. The chiral dynamics of quantum chromodynamics (QCD) is modeled by the Polykov-loop extended Quark-Meson Lagrangian, that includes the coupling of quarks to vector meson and temporal gauge fields. The Functional Renormalization Group is employed to properly account for the $O(4)$ criticality at the phase boundary. We focus on the properties and systematics of ratios of the net-baryon-number cumulants ${\chi }_B^n$, for $1\le n\le 6$, near the phase boundary. The results are presented in the context of the recent experimental data of the STAR Collaboration on fluctuations of the net proton number in heavy ion collisions at RHIC. We show that the model results for the energy dependence of the cumulant ratios are in good overall agreement with the data, with one exception. At center-of-mass energies below $19.6\mathrm{GeV}$, we find that the measured fourth-order cumulant deviates considerably from the model results, which incorporate the expected $O(4)$ and $Z(2)$ criticality. We assess the influence of model assumptions and in particular of repulsive vector-interactions, which are used to modify the location of the critical endpoint in the model, on the cumulants ratios. Finally, we discuss a possibility to test to what extent the fluctuations are affected by nonequilibrium dynamics by comparing certain ratios of cumulants.

   hep-phnucl-thPRD(2017)·63 citations
10. 10*

    Small-x behavior of non-singlet spin structure function and Bjorken sum rule with pQCD correction up to NNLO and Higher twist correction

    Nayan Mani Nath🇮🇳 · Jayanta Kumar Sarma🇮🇳

    A calculation of the non-singlet part of spin dependent structure function, $x{g}_1^{NS}(x,Q^2)$ and associated sum rule, the Bjorken Sum rule up to next-next-to-leading order(NNLO) is presented. We use a unified approach incorporating Regge theory and the theoretical framework of perturbative Quantum Chromodynamics. Using a Regge behaved model with $Q^2$ dependent intercept as the initial input, we have solved the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equation up to NNLO at small-$x$ for $x{g}_1^{NS}(x,Q^2)$ and the solutions are utilised to calculate the polarised Bjorken sum rule(BSR). We have also extracted the higher twist contribution to BSR based on a simple parametrisation. These results for both of $x{g}_1^{NS}(x,Q^2)$ and BSR, along with higher twist corrections are observed to be consistent with the available data taken from SMC, E143, HERMES, COMPASS and JLab experiments. In addition, our results are also compared with that of other theoretical and phenomenological analysis based on different models and a very good agreement is also observed in this regard. Further a very good consistency between our calculated results and theoretical QCD predictions of BSR is also achieved.

    hep-phInt.J.Theor.Phys.(2017)·4 citations
11. 11*

    NNLO QCD corrections to jet production in deep inelastic scattering

    James Currie🇬🇧 · Thomas Gehrmann🇨🇭 · Alexander Huss🇨🇭 · Jan Niehues🇨🇭

    Hadronic jets in deeply inelastic electron-proton collisions are produced by the scattering of a parton from the proton with the virtual gauge boson mediating the interaction. The HERA experiments have performed precision measurements of inclusive single jet production and di-jet production in the Breit frame, which provide important constraints on the strong coupling constant and on parton distributions in the proton. We describe the calculation of the next-to-next-to-leading order (NNLO) QCD corrections to these processes, and assess their size and impact. A detailed comparison with data from the H1 and ZEUS experiments highlights that inclusive single jet production displays a better perturbative convergence than di-jet production. We also observe that the event selection cuts in some of the di-jet measurements of both H1 and ZEUS induce an infrared sensitivity that destabilises the perturbative stability of the predictions. Our results open up new opportunities for QCD precision studies with jet production observables in deep inelastic scattering.

    hep-phJHEP(2017)·93 citations
12. 12*

    Nonleptonic charmless decays of $B_c\to TP,TV$ in the perturbative QCD approach

    Xin Liu🇨🇳 · Run-Hui Li🇨🇳 · Zhi-Tian Zou🇨🇳 · Zhen-Jun Xiao🇨🇳

    Two-body charmless hadronic $B_c$ decays involving a light $1^3{P}_2$-tensor($T$) meson are investigated for the first time within the framework of perturbative QCD(pQCD) at leading order, in which the other meson is the lightest pseudoscalar($P$) or vector($V$) state. The concerned processes can only occur through the pure weak annihilation topology in the standard model. We predict the CP-averaged branching ratios and polarization fractions of those considered decays in Cabibbo-Kobayashi-Maskawa(CKM) favored and suppressed modes. Phenomenologically, several modes$-$such as the $B_c\to K_2^{\ast }(1430)K$ and the CKM-favored $B_c\to TV-$have large decay rates of $10^{-6}$, which are expected to be detected at Large Hadron Collider experiments in the near future. Moreover, all of the $B_c\to TV$ modes are governed by the longitudinal amplitudes in the pQCD calculations and the corresponding fractions vary around $78\%$-$98\%$. A confirmation of these results could prove the reliability of the pQCD approach used here and further shed some light on the annihilation decay mechanism.

    hep-phhep-exPRD(2017)·19 citations
13. 13*

    Lepton-flavor universality violation in $R_K$ and $R_{D^{(\ast )}}$ from warped space

    Eugenio Megias🇪🇸 · Mariano Quiros🇪🇸 · Lindber Salas🇪🇸

    Some anomalies in the processes $b\to s\ell \ell$ ($\ell =\mu ,e$) and $b\to c\ell {\bar{\nu }}_{\ell }$ ($\ell =\tau ,\mu ,e$), in particular in the observables $R_K$ and $R_{D^{(\ast )}}$, have been found by the BaBar, LHCb and Belle Collaborations, leading to a possible lepton flavor universality violation. If these anomalies were confirmed they would inevitably lead to physics beyond the Standard Model. In this paper we try to accommodate the present anomalies in an extra dimensional theory, solving the naturalness problem of the Standard Model by means of a warped metric with a strong conformality violation near the infra-red brane. The $R_K$ anomaly can be accommodated provided that the left-handed bottom quark and muon lepton have some degree of compositeness in the dual theory. The theory is consistent with all electroweak and flavor observables, and with all direct searches of Kaluza-Klein electroweak gauge bosons and gluons. The fermion spectrum, and fermion mixing angles, can be reproduced by mostly elementary right-handed bottom quarks, and tau and muon leptons. Moreover the $R_{D^{(\ast )}}$ anomaly requires a strong degree of compositeness for the left-handed tau leptons, which turns out to be in tension with experimental data on the $g_{{\tau }_L}^Z$ coupling, possibly unless some degree of fine-tuning is introduced in the fixing of the CKM matrix.

    hep-phJHEP(2017)·85 citations
14. 14*

    A UV Complete Compositeness Scenario: LHC Constraints Meet The Lattice

    Luigi Del Debbio🇬🇧 · Christoph Englert🇬🇧 · Roman Zwicky🇬🇧

    We investigate a recently proposed UV-complete composite Higgs scenario in the light of the first LHC runs. The model is based on a $SU(4)$ gauge group with global flavour symmetry breaking $SU(5)\to SO(5)$, giving rise to pseudo Nambu-Goldstone bosons in addition to the Higgs doublet. This includes a real and a complex electroweak triplet with exotic electric charges. Including these, as well as constraints on other exotic states, we show that LHC measurements are not yet sensitive enough to significantly constrain the model's low energy constants. The Higgs potential is described by two parameters which are on the one hand constrained by the LHC measurement of the Higgs mass and Higgs decay channels and on the other hand can be computed from correlation functions in the UV-complete theory. Hence to exclude the model at least one constant needs to be determined and to validate the Higgs potential both constants need to be reproduced by the UV-theory. Due to its UV-formulation, a certain number of low energy constants can be computed from first principle numerical simulations of the theory formulated on a lattice, which can help in establishing the validity of this model. We assess the potential impact of lattice calculations for phenomenological studies, as a preliminary step towards Monte Carlo simulations.

    hep-phhep-latJHEP(2017)·18 citations
15. 15*

    A Case for Future Lepton Colliders

    Nathaniel Craig🇺🇸

    I present a case for proposed future linear and circular lepton colliders as ideal machines for understanding and exploration. As machines for understanding, they provide unprecedented tools for studying the Higgs and observing phenomena never before seen in nature. As machines for exploration, they are ideally suited to discovering new particles interacting too weakly to be seen otherwise. These arguments for future lepton colliders are largely independent of the as-yet-unknown outcome of the LHC physics program.

    hep-phhep-ex13 citations
16. 16*

    Radiative decay widths of ground and excited states of vector charmonium and bottomonium

    Hluf Negash🇷🇺 · Shashank Bhatnagar🇮🇳

    In this work we study the radiative decay widths of vector quarkonia for the process of $J/\psi (nS)\to {\eta }_c(nS)\gamma$ and ${\rm Y}(nS)\to {\eta }_b(nS)\gamma$ (for principal quantum numbers $n=1,2,3$) in the framework of Bethe-Salpeter equation under the covariant instantaneous ansatz using a $4\times 4$ form of BSE. The parameters of the framework were determined by a fit to the mass spectrum of ground states of pseudoscalar and vector quarkonia, such as; ${\eta }_c$, ${\eta }_b$, $J/\psi$ and ${\rm Y}$. These input parameters so fixed were found to give good agreements with data on mass spectra of ground and excited states of pseudoscalar and vector quarkonia, leptonic decay constants of pseudoscalar and vector quarkonia, two photon decays and two gluon decays of pseudoscalar quarkonia in our recent paper. With these input parameters so fixed, the radiative decay widths of ground (1S) and excited (2S, 3S) states of heavy vector quarkonia ($J/\Psi$ and ${\rm Y}$) are calculated and found to be in reasonable agreement with data.

    hep-phAdv.High Energy Phys.(2017)·14 citations
17. 17*

    Fermion number violating effects in low scale leptogenesis

    Shintaro Eijima🇨🇭 · Mikhail Shaposhnikov🇨🇭

    The existence of baryon asymmetry and dark matter in the Universe may be related to CP-violating reactions of three heavy neutral leptons (HNLs) with masses well below the Fermi scale. The dynamical description of the lepton asymmetry generation, which is the key ingredient of baryogenesis and of dark matter production, is quite complicated due to the presence of many different relaxation time scales and the necessity to include quantum-mechanical coherent effects in HNL oscillations. We derive kinetic equations accounting for fermion number violating effects missed so far and identify one of the domains of HNL masses that can potentially lead to large lepton asymmetry generation boosting the sterile neutrino dark matter production.

    hep-phPLB(2017)·53 citations
18. 18*

    GeV-scale hot sterile neutrino oscillations: a derivation of evolution equations

    J. Ghiglieri🇨🇭 · M. Laine🇨🇭

    Starting from operator equations of motion and making arguments based on a separation of time scales, a set of equations is derived which govern the non-equilibrium time evolution of a GeV-scale sterile neutrino density matrix and active lepton number densities at temperatures T > 130 GeV. The density matrix possesses generation and helicity indices; we demonstrate how helicity permits for a classification of various sources for leptogenesis. The coefficients parametrizing the equations are determined to leading order in Standard Model couplings, accounting for the LPM resummation of 1+n <-> 2+n scatterings and for all 2 <-> 2 scatterings. The regime in which sphaleron processes gradually decouple so that baryon plus lepton number becomes a separate non-equilibrium variable is also considered.

    hep-phJHEP(2017)·84 citations
19. 19*

    A fresh look at the determination of |V_cb| from B-> D^* l nu

    Dante Bigi🇮🇹 · Paolo Gambino🇮🇹 · Stefan Schacht🇮🇹

    We use recent Belle results on ${\bar{B}}^0\to D^{\ast +}{l}^{-}{\bar{\nu }}_l$ decays to extract the CKM element $|V_{cb}|$ with two different but well-founded parameterizations of the form factors. We show that the CLN and BGL parameterizations lead to quite different results for $|V_{cb}|$ and provide a simple explanation of this unexpected behaviour. A long lasting discrepancy between the inclusive and exclusive determinations of $|V_{cb}|$ may have to be thoroughly reconsidered.

    hep-phhep-exPLB(2017)·180 citations
20. 20*

    Vector-like Fermions and Higgs Effective Field Theory Revisited

    Chien-Yi Chen🇨🇦 · S. Dawson🇺🇸 · Elisabetta Furlan🇨🇭

    Heavy vector-like quarks (VLQs) appear in many models of beyond the Standard Model physics. Direct experimental searches require these new quarks to be heavy, $\text{gsim}$ 800-1000 GeV. We perform a global fit of the parameters of simple VLQ models in minimal representations of $SU(2{)}_L$ to precision data and Higgs rates. An interesting connection between anomalous $Zb\overline{b}$ interactions and Higgs physics in VLQ models is discussed. Finally, we present our analysis in an effective field theory (EFT) framework and show that the parameters of VLQ models are already highly constrained. Exact and approximate analytical formulas for the $S$ and $T$ parameters in the VLQ models we consider are posted at https://quark.phy.bnl.gov/Digital_Data_Archive/dawson/vlq_17/ as Mathematica files.

    hep-phPRD(2017)·89 citations
21. 21*

    Interference in spectrum of radiation from doubly scattered charged particle

    M.V. Bondarenco🇺🇦 · N.F. Shul'ga🇺🇦

    Existence of different types of interference in the spectrum of radiation emitted by a doubly hard scattered electron is demonstrated. The spectrum develops oscillations in two regions: the hard, where the oscillations depend on the electron Lorentz factor, and the soft, where the oscillations depend on the electron scattering angles. This interference pattern owes to the presence of jetlike radiation configurations, formed by a piecewise-rectilinearly moving electron and the accompanying photon. The corresponding nondipole decomposition relation is derived. Notions describing proper field formation and interference, and presumably being applicable more generally, are discussed in detail.

    ↳ physics.acc-phhep-phPRD(2017)·3 citations
22. 22*

    Core-corona interplay in Pb-Pb collisions at $\sqrt{s_{NN}}$=2.76 TeV

    M. Petrovici🇷🇴 · I. Berceanu🇷🇴 · A. Pop🇷🇴 · M. Târzilă🇷🇴 · C. Andrei🇷🇴

    A simple approach based on the separation of wounded nucleons in an A-A collision in two categories, those suffering single collisions - corona and the rest - core, estimated within a Glauber Monte-Carlo approach, explains the centrality dependence of the light flavor hadrons production in Pb-Pb collisions at $\sqrt{s_{NN}}$=2.76 TeV. The core contribution does not include any dependence of any process on the fireball shape as a function of the impact parameter. Therefore, the ratios of the $p_T$ distributions to the one corresponding to the minimum bias pp collisions at the same energy, each of them normalised to the corresponding charged particle density, the $⟨p_T⟩$ and transverse energy per unit of rapidity are reproduced less accurate by such an approach. The results show that the corona contribution plays an important role also at LHC energies and it has to be considered in order to evidence the centrality dependence of different observables related to the core properties and dynamics.

    ↳ nucl-thhep-phPRC(2017)·13 citations
23. 23*

    3+1d quasiparticle anisotropic hydrodynamics for ultrarelativistic heavy-ion collisions

    Mubarak Alqahtani🇺🇸 · Mohammad Nopoush🇺🇸 · Radoslaw Ryblewski🇵🇱 · Michael Strickland🇺🇸

    We present the first comparisons of experimental data with phenomenological results from 3+1d quasiparticle anisotropic hydrodynamics (aHydroQP). We compare charged-hadron multiplicity, identified-particle spectra, identified-particle average transverse momentum, charged-particle elliptic flow, and identified-particle elliptic flow produced in LHC 2.76 TeV Pb+Pb collisions. The dynamical equations used for the hydrodynamic stage utilize non-conformal aHydroQP. The resulting aHydroQP framework naturally includes both shear and bulk viscous effects in addition to higher-order non-linear transport coefficients. The 3+1d aHydroQP evolution obtained is self-consistently converted to hadrons using anisotropic Cooper-Frye freezeout performed on a fixed-energy-density hypersurface. The final production and decays of the primordial hadrons are modeled using a customized version of THERMINATOR 2. In this first study, we utilized smooth Glauber-type initial conditions and a single effective freeze-out temperature T_FO = 130 MeV with all hadronic species in full chemical equilibrium. With this rather simple setup, we find a very good description of many heavy-ion observables.

    ↳ nucl-thhep-phPRL(2017)·95 citations
24. 24*

    Quantum Oscillations in the Chiral Magnetic Conductivity

    Sahal Kaushik🇺🇸 · Dmitri E. Kharzeev🇺🇸

    In strong magnetic field the longitudinal magnetoconductivity in 3D chiral materials is shown to exhibit a new type of quantum oscillations arising from the chiral magnetic effect (CME). These quantum CME oscillations are predicted to dominate over the Shubnikov-de Haas (SdH) ones in chiral materials with an approximately conserved chirality of quasiparticles at strong magnetic fields. The phase of quantum CME oscillations differs from the phase of the conventional SdH oscillations by $\pi /2$.

    ↳ cond-mat.mes-hallhep-phPRB(2017)·13 citations
25. 25*

    Interplay of Reggeon and photon in pA collisions

    Gokce Basar🇺🇸 · Dmitri Kharzeev🇺🇸 · Ho-Ung Yee🇺🇸 · Ismail Zahed🇺🇸

    We discuss the effects of the electromagnetic interaction in high-energy proton collisions with nuclei of large Z at strong coupling $\lambda =g^2{N}_c$. Using the holographic dual limit of large $N_c>\lambda \gg 1$, we describe the Reggeon exchange as a twisted surface and show that it gets essentially modified by the electromagnetic interaction.

    ↳ nucl-thhep-phhep-thPRD(2017)·3 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.